/Engine/Source/Editor/UnrealEd/Public/Subsystems/PanelExtensionSubsystem.h
void RegisterPanelFactory ( [FName](API\Runtime\Core\UObject\FName) ExtensionPanelID, const [FPanelExtensionFactory](API\Editor\UnrealEd\Subsystems\FPanelExtensionFactory) & InPanelExtensionFactory )